Source: Science Nature Page.

The “Squidworm” is believed to be a transitional organism from benthic worms to free-swimming pelagic worms.  They are named Squidworms due to their tentacle-like branchiae and palps.

(source)

sports walkman by picogram_art

Agatized Cerithium (Eocene) - Assa, Morocco

Glacial Striations and Stromatolites and Geology, oh my!

This photo is a two-fer: two awesome geology features in one! On the surface of this rock you will notice faint lines that stretch from the lower left hand corner of the image to the upper right hand corner. These lines are called glacial striations and they form as a glacier scratches the rock surface as it moves. 

The rock surface that was scratched by the moving glacier represents an entirely different time, waaay before the glaciers, when stromatolites dotted the shoreline of an ancient water body that covered Montana. The circles that you see in the rock are the tops of stromatolites, formed by ancient cyanobacteria. 

A great place to see stromatolites and striations is on the Grinnell Glacier Trail. For your best chance of seeing these features free of snow, try hiking the trail in late July or August. NPS Photo

[Image Description: Lines and circles etched into a rock surface.]

More fossils from the Lapworth Museum of geology!

Top to bottom:

- Cambrian (Marrella splendens, Hurdia victoria, trilobites)

- Devonian fish (Pteraspis, Drepanaspis, Bothriolepis, Cephalaspis)

- Permian (Dimetrodon, Mesosaurus)

- Quarternary (Smilodon)

Japanese Ice-cream Machine.

Mood

You and I had a fight recently.